Authorities say a man charged with the murder of an off-duty Cook County sheriff’s deputy had a conversion device on a handgun, which allowed it to fire 30 rounds in two seconds. WBBM’s Mike Krauser reports.

<p>Authorities say a man charged with the murder of an off-duty Cook County sheriff’s deputy had a conversion device on a handgun, which allowed it to fire 30 rounds in two seconds. WBBM’s Mike Krauser reports.</p>

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